Materials Literature
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The control of the refractive index of laminated coatings consisting of alternating stacks of nanoscale Al2O3 and TiO2 sublayers grown by atomic layer deposition has been achieved. The refractive index of the coating linearly changed from 1.870 to 2.318 as the thickness of the single TiO2 sublayer was varied from 2.0…
By use of first-principles calculations, we investigate the effect of introducing substitutional boron or nitrogen atom in the tip on field-emission properties of capped single-wall carbon nanotubes. We find that the substitution in the tip can significantly enhance the localized density of states at the Fermi level,…
We report results of a high-pressure investigation by Raman spectroscopy of a classic relaxor ferroelectric (relaxor) ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN), which is considered to be a model system for the understanding of relaxor and relaxor-related materials. The observed pressure-dependen…
Low-frequency Raman-scattering experiments have been performed on thin films consisting of nickel-silver composite nanoparticles embedded in alumina matrix. It is observed that the Raman scattering by the quadrupolar modes, strongly enhanced when the light excitation is resonant with the surface dipolar excitation, is…
We report on the precise placement of a single carbon nanotube (CNT) onto a microlectromechanial system (MEMS) structure. Using a hybrid atomic force microscope/scanning electron microscope (AFM/SEM) system, an individual multiwalled CNT was retrieved from a cartridge by the AFM tip, translated to a MEMS device, and t…
Based on the theoretical exploration of electronic structures, we propose that the ordered double perovskites $\mathrm{La}A{\mathrm{VRuO}}_{6}$ and ${\mathrm{LaVO}}_{3}/A{\mathrm{RuO}}_{3}$ (001) superlattice $(A=\mathrm{Ca},$ Sr, and Ba) are strong candidates for half-metallic (HM) antiferromagnets (AFM's). We have s…
We have investigated the electronic structure of the p-type diluted magnetic semiconductor ${\mathrm{In}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ by photoemission spectroscopy. The Mn $3d$ partial density of states is found to be basically similar to that of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\m…
The compressibility and thermal expansion of the cubic silicon nitride $(c\ensuremath{-}{\mathrm{Si}}_{3}{\mathrm{N}}_{4})$ phase have been investigated by performing in situ x-ray powder-diffraction measurements using synchrotron radiation, complemented with computer simulations by means of first-principles calculati…
The superconducting ferromagnet RuSr2GdCu2O8 was investigated at high pressure. The intra-grain superconducting transition temperature, Tc, is resolved in ac-susceptibility as well as resistivity measurements. It is shown that the pressure shift of Tc is much smaller than that of other high-Tc compounds in a similar d…
A theoretical framework is developed to describe experiments on the structure of epitaxial thin films, particularly niobium on sapphire. We extend the hypothesis of dynamical scaling to apply to the structure of thin films from its conventional application to simple surfaces. We then present a phenomenological continu…
We describe in this paper the development of plugged hexagonal templated silicas (PHTS) which are hexagonally ordered materials, with internal microporous silica nanocapsules; they have a combined micro- and mesoporosity and a tuneable amount of both open and encapsulated mesopores and are much more stable than other…
Measurements of the low-shear viscosity eta(o) with a Zimm-Crothers viscometer for dispersions of colloidal hard spheres are reported as a function of volume fraction phi up to 0.56. Nonequilibrium theories based on solutions to the two-particle Smoluchoski equation or ideal mode coupling approximations do not capture…
Quantum Monte Carlo method is used to study the coupled spin-pseudospin Hamiltonian in one-dimension (1D) that models the charge-ordering instability of the anisotropic Hubbard ladder at quarter filling. We calculate the temperature dependence of the uniform spin susceptibility and the spin and charge excitation spect…
A numerical model of single-domain nanoscale iron magnets fabricated using scanning-microscope-assisted chemical vapor deposition is simulated using finite-temperature micromagnetics. A Projective-dynamics method is used to determine the magnetization at the saddle point as a function of temperature. This magnetizatio…
The nonequilibrium dynamics of a binary Lennard-Jones mixture in a simple shear flow is investigated by means of molecular dynamics simulations. The range of temperature T investigated covers both the liquid, supercooled, and glassy states, while the shear rate γ covers both the linear and nonlinear regimes of rheolog…
We directly observe phonon wave packets of well-defined frequency and polarization scattering at a coherent semiconductor interface using molecular-dynamics simulations. We find that in the low-frequency limit the transmission coefficients of both longitudinal and transverse acoustic phonons agree well with those pred…
Abstract Cathodic prevention systems are now widely recommended for new reinforced concrete structures that are to be exposed to chloride containing environments. However, there are very little published data or design guidelines for such systems. In two new petrochemical plants, reinforced concrete seawater structure…
Abstract In subsea oil and gas production, both corrosion inhibitors and hydrate inhibitors are used for chemical treatment due to the severe conditions encountered. Performance is traditionally measured separately due to the low CO2 corrosion rates at temperatures where hydrates form, resulting in plugged flowlines.…
Abstract Seawater is an aggressive, complex fluid that affects nearly all common structural materials to some extent. There are two competing processes that operate simultaneously in seawater environments: (1) the chloride ion activity tends to destroy the passive film, and (2) dissolved oxygen, which acts to promote…
Abstract A multielectrode localized corrosion sensor was developed and used for comparing localized corrosion of Fe-Ni-Cr-Mo alloys in chloride solutions. Experimental results indicated that the coupled multielectrode sensor provides a rapid real-time response to changes in temperature and salt concentration. It was d…